摘要
从一个多亲本的复式杂交后代中，选育了 ４ 个高抗纹枯病的小麦新品系，编号为 ＭＮ－ ３、７、１８和 １９。抗病性鉴定证明，在对照品种绵阳１９ 病株率１００％ ，发病等级４～５ 级的情况下，这 ４ 个新品系的病株率和发病等级分别在 ３．６５％ ～６．９８％ 和 ０～１ 之间。这 ４ 个品系与高感纹枯病的小麦品种绵阳 １９ 杂交，在 Ｆ２ 代群体中植株符合抗∶感＝ ３∶１ 的分离比率，在隐性亲本的测交后代中符合 １∶１的分离比率；在这４ 个品系之间的杂交后代群体中未观察到抗性的分离。试验结果指出，４ 个品系均含有同一个抗小麦纹枯病的单显性抗病基因，该基因被命名为 Ｓｅｓ １。本研究指出了小麦抗纹枯病育种的可能性。
Four wheat lines, which were named MN-3, -7, -18 and -19, and expressed high resistance to sharp eyespot, were selected from progeny of complex crosses. The rates of diseased plants and disease severity of these wheat lines ranged from 3.65% to 6.98% and from 0 to 1, respectively, whereas the control(cv. Mianyang 19) expressed 100% and 4-5, respectively. Analysis for resistance to sharp eyespot showed that the F2 populations of the crosses between these 4 lines and the susceptible cultivar (Mianyang 19) gave 3∶1 ratios for resistant to susceptible plants. Segregation of resistance in populations resulted from backcrosses fit the 1∶1 ratio. No segregation was found in the offsprings of crosses between these 4 lines. Results indicated that these wheat lines contained a single dominant gene for resistance to sharp eyespot. This gene was named Ses 1. The present study showed possibility to breed wheat resistant to sharp eyespot.
出处
《植物病理学报》
CAS
CSCD
北大核心
1999年第3期199-202,共4页
Acta Phytopathologica Sinica
基金
四川省教委资助课题
关键词
小麦
纹枯病
抗性
抗病基因
抗病育种
Wheat sharp eyespot, resistance gene, breeding for disease resistance
